Attrition mill propeller



FIG. 1 is a perspective view of an attrition mill propeller showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the attrition mill propeller that form no part of the claimed design. 

CLAIM The ornamental design for an attrition mill propeller, as shown and described. 